Question

Dave can remove the weeds from a garden in 15 days and Subhash can do the same work in 10 days how long will they take to remove the weeds when working together

Answer 1

Dave can do the work alone in 15 days.
Work done by Dave in one day=1/15
Subhash can do the work alone in 10 days.
Work done by Subhash in one day=1/10
work done by both of them together in one day is=1/10+1/15
                                                                                    =1/6
days they will they take to remove the weeds when working together=1/(1/6)
                                                                                                                     =6 days

Answer 2

Answer:

dev can remove the weeds from a garden in 15

in 1 day 1/15

Shubhashcan do the same work in 10 days

in 1 day 1/10